Understanding Timestamps in LJLogUD and LJLogM

The first column in the data file written by LJLogUD or LJLogM is a timestamp of seconds since midnight January 1st (Universal Time), 1904.  This is a very common timestamp format that tells us absolute and relative time. 

A complete tutorial of how to convert this to an easy to read format is available here: 

LJLogUD & LJLogM Timestamps